NEETChemistryElectrochemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): If the standard electrode potentials for A²⁺/A and A^+/A are x V and y V respectively, then the standard electrode potential for A²⁺/A^+ is (2x - y) V. Reason (R): Standard electrode potentials are extensive properties and can be directly added or subtracted to obtain the potential of a new half-ce
Options
- ABoth Assertion (A) and Reason (R) are correct and Reason (R) is the correct explanation of Assertion (A)
- BBoth Assertion (A) and Reason (R) are correct but Reason (R) is not the correct explanation of Assertion (A)
- CAssertion (A) is correct but Reason (R) is incorrect
- DAssertion (A) is incorrect but Reason (R) is correct
Correct answer
C. Assertion (A) is correct but Reason (R) is incorrect
Step-by-step solution
Assertion (A) is correct: The standard electrode potentials cannot be directly added, but standard Gibbs free energy changes ( G^ ) can be. For A²⁺ + 2e^- A , G^ ₁ = -2Fx For A^+ + e^- A , G^ ₂ = -Fy The target reaction is A²⁺ + e^- A^+ , which is obtained by subtracting the second reaction from the first. G^ ₃ = G^ ₁ - G^ ₂ = -2Fx - (-Fy) = -2Fx + Fy Since G^ ₃ = -1FE^ ₃ , we have -FE^ ₃ = -F(2x - y) , which gives E^ ₃ = (2x - y) V. Reason (R) is incorrect: Standard electrode potential ( E^ ) is an intensive prope